750ti video playback issue.

I followed opencore vanilla guide and successfully installed 10.13.4 on AMD2700, MSI B450 setup. I also installed the CUDA and webdriver for 750ti, everything is going ok. But then when I try to play a video with VLC/Elmedia Player/Quicktime, none are playing. VLC would freeze when I drag the progress bar, Elmedia can display a snapshot at different points but not playing, what can I do?

submitted by /u/Proof-Crow
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